Why does Text.Show.Functions only return <function>?
The standard package for displaying functions only returns a constant:
λ> :m +Text.Show.Functions
λ> show (+1)
"<function>"
GHCi is :type
much more useful:
λ> :t (+1)
(+1) :: Num a => a -> a
Can't get that level of verbosity at runtime? Does the compilation process describe any information at all about functions, except that they are functions?
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1 answer
Not exactly the same level of detail, but you can use typeOf
from Data.Typeable :
Prelude> import Data.Typeable
Prelude Data.Typeable> typeOf (+1)
Integer -> Integer
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